/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    quadraticFitSnGradData

Description
    Data for the quadratic fit correction snGrad scheme

SourceFiles
    quadraticFitSnGradData.C

\*---------------------------------------------------------------------------*/

#ifndef quadraticFitSnGradData_H
#define quadraticFitSnGradData_H

#include "MeshObject.H"
#include "fvMesh.H"
#include "extendedCellToFaceStencil.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                    Class quadraticFitSnGradData Declaration
\*---------------------------------------------------------------------------*/

class quadraticFitSnGradData
:
    public MeshObject<fvMesh, quadraticFitSnGradData>
{
    // Private data

        const scalar centralWeight_;
        const label dim_;

        //- minimum stencil size
        const label minSize_;

        //- Extended stencil addressing
        extendedCellToFaceStencil stencil_;

        //- For each cell in the mesh store the values which multiply the
        //  values of the stencil to obtain the gradient for each direction
        List<scalarList> fit_;


    // Private Member Functions

        //- Find the normal direction and i, j and k directions for face faci
        static void findFaceDirs
        (
            vector& idir,        // value changed in return
            vector& jdir,        // value changed in return
            vector& kdir,        // value changed in return
            const fvMesh& mesh,
            const label faci
        );

        label calcFit(const List<point>&, const label faci);


public:

    TypeName("quadraticFitSnGradData");


    // Constructors

        explicit quadraticFitSnGradData
        (
            const fvMesh& mesh,
            const scalar cWeight
        );


    //- Destructor
    virtual ~quadraticFitSnGradData()
    {};


    // Member functions

        //- Return reference to the stencil
        const extendedCellToFaceStencil& stencil() const
        {
            return stencil_;
        }

        //- Return reference to fit coefficients
        const List<scalarList>& fit() const { return fit_; }

        //- Delete the data when the mesh moves not implemented
        virtual bool movePoints();
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
